Gas turbine filtration system with inlet filter orientation assembly

ABSTRACT

The present application provides a filtration system for a gas turbine engine. The filtration system may include a holding frame with a positioning element extending therefrom and a filtration unit for mounting within the holding frame. The filtration unit may include a positioning slot therein such that the positioning element extends through the positioning slot when the filtration unit is mounted within the holding frame.

TECHNICAL FIELD

The present application and the resultant patent relate generally to gasturbine engines and more particularly relate to a gas turbine filtrationsystem with an inlet filter holding frame having a positioning assemblyto ensure the correct orientation of the filters therein.

BACKGROUND OF THE INVENTION

Power generation equipment, such as a gas turbine engine and the like,generally uses a large supply of intake air to support the combustionprocess. Various types of inlet air filtration systems thus may be usedupstream of the gas turbine compressor air inlet and elsewhere. Impureair laden with dust particles, salts, and other contaminants may causedamage to the compressor blades, other types of compressor components,and other components of the gas turbine engine in general. Contaminatesmay cause damage via corrosion, erosion, and the like. Such damage mayreduce the life expectancy and performance of the compressor and alsoreduce the overall efficiency of the gas turbine engine. To avoid theseproblems, the inlet airflow generally passes through a series of filtersand screens to assist in removing the contaminants before they reach thecompressor or elsewhere.

Such filters may include “V cell” type, “mini-pleat” or bag filters andthe like. These filters are generally square in configuration and may beinstalled in holding frames sized according to industry standards. Theuse of these square frames, however, may allow for the filters to beinstalled in the wrong orientation. Specifically, the filters may beinstalled with the pleats or pockets running in a horizontal orientationrather that a substantially vertical orientation that may promote gooddrainage. Moreover, unsuitable or unauthorized filters also may be used.Installing the filters in the wrong orientation or installing unsuitablefilters could have a negative impact on overall gas turbine engineperformance and efficiency.

There is thus a desire for an improved inlet air filtration system foruse with a compressor and similar components of a gas turbine engine.Such an improved inlet air filtration system may accommodate V cell,mini-pleat, or bag filters and the like while ensuring that the filtersare installed in the correct orientation for efficient operation andgood sealing.

SUMMARY OF THE INVENTION

The present application and the resultant patent provide a filtrationsystem for a gas turbine engine. The filtration system may include aholding frame with a positioning element extending therefrom and afiltration unit for mounting within the holding frame. The filtrationunit may include a positioning slot therein such that the positioningelement extends through the positioning slot when the filtration unit ismounted within the holding frame.

The present application and the resultant patent further provide amethod of ensuring a correct orientation of a filtration unit within aholding frame of a filtration system. The method may include the stepsof attaching a positioning element about the filtration unit, forming apositioning slot in the filtration unit such that the positioning slotis sized and positioned to accommodate the positioning element, mountingthe filtration unit within the holding frame, and aligning thepositioning slot and the positioning element so as to orient thefiltration unit.

The present application and the resultant patent further provide afiltration system for a gas turbine engine. The filtration system mayinclude a holding frame with a positioning rod extending therefrom and asquare filter with an end cap for mounting within the holding frame. Theend cap may include a positioning slot therein such that the positioningrod extends through the positioning slot when the square filter ismounted within the holding frame so as to ensure the correctinstallation of the square filter therein.

These and other features and improvements of the present application andthe resultant patent will become apparent to one of ordinary skill inthe art upon review of the following detailed description when taken inconjunction with the several drawings and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a gas turbine engine with a compressor,combustor, a turbine, a shaft, and a load. An inlet air filtrationsystem is positioned about the compressor.

FIG. 2 is a perspective view of a filtration unit as may be used withthe filtration system of FIG. 1.

FIG. 3 is a side plan view of a filtration system with an orientationassembly as may be described herein.

FIG. 4 is an expanded side view of the filtration system with theorientation assembly of FIG. 3.

FIG. 5A is a top plan view of an alternative embodiment of anorientation assembly as may be described herein.

FIG. 5B is a side plan view of the orientation assembly of FIG. 5A.

FIG. 6 is a perspective view of an alternative embodiment of anorientation assembly as may be described herein.

FIG. 7 is a top plan view of an alternative embodiment of a positioningrod as may be described herein.

DETAILED DESCRIPTION

Referring now to the drawings, in which like numerals refer to likeelements throughout the several views, FIG. 1 shows a schematic view ofgas turbine engine 10 as may be used herein. The gas turbine engine 10may include a compressor 15. The compressor 15 compresses an incomingflow of air 20. The compressor 15 delivers the compressed flow of air 20to a combustor 25. The combustor 25 mixes the compressed flow of air 20with a pressurized flow of fuel 30 and ignites the mixture to create aflow of combustion gases 35. Although only a single combustor 25 isshown, the gas turbine engine 10 may include any number of combustors25. The flow of combustion gases 35 is in turn delivered to a turbine40. The flow of combustion gases 35 drives the turbine 40 so as toproduce mechanical work. The mechanical work produced in the turbine 40drives the compressor 15 via a shaft 45 and an external load 50 such asan electrical generator and the like.

The gas turbine engine 10 may use natural gas, liquid fuels, varioustypes of syngas, and/or other types of fuels or blends thereof. The gasturbine engine 10 may be any one of a number of different gas turbineengines offered by General Electric Company of Schenectady, N.Y.,including, but not limited to, those such as a 7 or a 9 series heavyduty gas turbine engine and the like. The gas turbine engine 10 may havedifferent configurations and may use other types of components. Othertypes of gas turbine engines also may be used herein. Multiple gasturbine engines, other types of turbines, and other types of powergeneration equipment also may be used herein together.

The gas turbine engine 10 also may be used with a filtration system 55.The filtration system 55 may include any number of filtration units 60positioned therein. The filtration system 55 may be positioned upstreamof the compressor 15 so as to filter the incoming flow of air 20 withrespect to particulate contaminates and/or water droplets. Thefiltration system 55 may be configured as a filter house or other typeof structure.

In this example, the filtration units 60 may be in the form of a numberof mini-pleat filters 65 and the like. As described above, suchmini-pleat filters 65 may have a generally square, planar configuration.Substantially rectangular shapes also may be used. Other types offilters such as bag or pocket type filters and the like also may be usedherein. The filtration units 60 may be pre-filters or final filters. Thefiltration units 60 may include a filter media 70 therein. The filtermedia 70 may be made from cellulose, blends of cellulose and polyester,glass microfiber, blends of glass microfiber and synthetic fibers,composites, and the like. Any type of filter media 70 may be usedherein. Differing types of filter media also may be used herein. Thefilter media 70 may be in the form of a number of pleats 75. Any numberof the pleats 75 may be used herein in any depth and/or angle. In orderto ensure efficient operation, the pleats 75 should be positionedvertically. Such a vertical orientation allows, for example, any watercaptured within the pleats 75 to drain away in an efficient manner.

As is shown in FIG. 2, the filter media 70 may be arranged in asubstantially W-shaped orientation 80. The filter media 70 may beenclosed within a mounting frame 85. The mounting frame 85 may be madeout of a thermoplastic or other type of substantially rigid material.The mounting frame 85 may include a pair of substantially W-shaped endcaps 90. The end caps 90 may be positioned at the top and bottom of thefilter material 70. The mounting frame 85 also may have a support screen(not shown) extending between the end caps 90. The support screen maysupport the filter media 70 therein and may help retain the filter mediain a given shape. The support screen allows air to pass therethrough.The filtration unit 60 described herein is for the purpose of exampleonly. Filtration units of many other designs and other configurationsalso may be used herein.

FIG. 3 and FIG. 4 show an example of a filtration system 100 as may bedescribed herein. Similar to that described above, the filtration system100 may include a number of filtration units 110. The filtration units110 may be in the form of a number of mini-pleat filters 120 similar tothat described above. Other types of filters such as bag or pocket typefilters and the like also may be used herein. The filters may bepre-filters or final filters. The filtration units 110 may include afilter media 130 installed within a mounting frame 140. The filter media130 may be in the form of a number of pleats 135. The mounting frame 140may have a pair of end caps, a first end cap 150 and a second end cap160. The end caps 150, 160 may be identical in shape or may vary. Themounting frame 140 also may include a support screen 170 extending fromthe first end cap 150 to the second end cap 160 in whole or in part. Thefiltration units 110 and the components thereof may have any size,shape, or configuration. Other types of filtering devices also may beused herein.

A number of the filtration units 110 may be installed within a holdingframe 180. The holding frame 180 may define a holding frame aperture 190therein. The holding frame aperture 190 may be sized for the filtrationunits 110 to be installed therein. As described above, the filtrationunits 110 and the holding frame aperture 190 both may have asubstantially square or rectangular shape and may be sized according toindustry standards. The distance from each end cap 150, 160 to theholding frame 180 may vary.

The filtration system 100 also may include an orientation assembly 200so as to align properly the filtration units 110 and the holding frame180. The orientation assembly 200 may include a positioning rod 210. Thepositioning rod 210 may be attached to or about the holding frame 180.The positioning rod 210 may have a somewhat angled configuration in thevertical direction. A substantially vertical configuration or any anglealso may be used. The positioning rod 210 may be substantially round,square, oval, T-shaped, and the like. The positioning rod 210 may haveany size, shape, or configuration. The positioning rod 210 may be anelement with any shape compatible with the filtration unit 110.

The orientation assembly 200 also may include one or more positioningslots 220 positioned within or about one or more of the end caps 150,160 of the filtration units 110 or elsewhere. The positioning slots 220likewise may be substantially round, square, oval, T-shaped, and thelike. The positioning slots 220 may have any size, shape, orconfiguration that is compatible with the positioning rod 210 or othertype of positioning element. The positioning rod 210 and the positioningslots 220 need not share the same shape, the positioning slots 220merely need be sized and positioned to accommodate the positioning rod210 therein when the filtration units 110 is installed within theholding frame 180. Other components and other configurations may be usedherein.

In use, the filtration units 110 may be installed within the holdingframe 180 via the orientation assembly 200. The orientation assembly 200ensures that the filtration units 110 are installed in the correctorientation with the pleats 135 of the filter media 130 positioned inthe substantially vertical orientation. The positioning rod 210 may becentrally positioned behind the filtration units 110 with thepositioning rod 210 aligning with the positioning slots 220 in the endcaps 150, 160 or elsewhere. The positioning rod 210 need only be locatedbehind the end cap depression, not necessarily behind the entirefiltration unit 110. Specifically, the positioning rod 210 should belocated between any “V” or a pocket in the filtration unit 110,centrally or not. The positioning rod 210 preferably should be mountedbehind at least one (1) filter per holding frame 180 although more thanone may be used. Moreover, the positioning rod 210 ensures that thefiltration units 110 are installed centrally within the holding frame180 so as to provide a generally gasket-like seal therebetween forefficient operation. Moreover, the positioning slots 220 may bepositioned such that only authorized filtration units 110 may be usedwith the positioning rod 210.

The orientation assembly 200 thus ensures the correct orientation of thefiltration units 110 within the holding frame 180 while providing goodsealing therein. Moreover, the orientation assembly 200 allows that onlyauthorized filters 120 may be used herein to ensure correct andefficient operation. The orientation assembly 200 may be originalequipment and/or replacement equipment. Other components and otherconfigurations may be used herein.

FIGS. 5A and 5B show an alternative embodiment of an orientationassembly 230 as may be described herein. In this example, thepositioning rod 210 may be attached to the holding frame 180 via a rodsupport 240. The rod support 240 may have any size, shape, ororientation. The positioning rod 210 may have as substantially verticalorientation. The positioning rod 210 likewise may be attached to theinlet house or to any other adjacent structure. FIG. 6 shows a furtheralternative embodiment of an orientation assembly 250 as may bedescribed herein. In this example, a positioning protrusion 260 may beused. The positioning protrusion 260 is shown as having a substantiallytriangular shape 270 although any size, shape, or configuration may beused. The positioning protrusion 260 may be an element with any shapecompatible with the filtration unit 110. The positioning protrusion 260may be attached to the holding frame 180 or elsewhere. The orientationassembly 250 further may include a positioning depression 280. Thepositioning depression 280 may be attached to the mounting frame 140,the end caps 150, 160 or elsewhere. The positioning depression 280likewise may have a substantially triangular shape although anycompatible size, shape, or configuration may be used. Other componentsand other configurations may be used herein.

FIG. 7 shows a further embodiment of a positioning rod 290. In thisexample, the positioning rod may have a substantial “L” like shape 300.The positioning rod 290 may interact with the filtration unit 110 behindthe depression of one of the end caps 150, 160 or elsewhere. Thepositioning rod 290 may have any size, shape, or configuration. Othercomponents and other configurations may be used herein.

It should be apparent that the foregoing relates only to certainembodiments of the present application and the resultant patent.Numerous changes and modifications may be made herein by one of ordinaryskill in the art without departing from the general spirit and scope ofthe invention as defined by the following claims and the equivalentsthereof.

We claim:
 1. A filtration system for a gas turbine engine, comprising: aholding frame; the holding frame comprising a positioning elementextending therefrom; and a filtration unit for mounting within theholding frame; the filtration unit comprising an end cap; the end capcomprising a positioning slot therein such that the positioning elementextends through the positioning slot when the filtration unit is mountedwithin the holding frame; and wherein the filtration unit comprises asubstantially square or rectangular shape.
 2. The filtration system ofclaim 1, wherein the positioning element comprises a positioning rod. 3.The filtration system of claim 1, wherein the positioning elementcomprises a positioning protrusion.
 4. The filtration system of claim 1,wherein the filtration unit comprises a mini-pleat filter with aplurality of pleats therein or a bag filter with a plurality of pocketstherein.
 5. The filtration system of claim 1, wherein the filtrationunit comprises a mounting frame.
 6. The filtration system of claim 1,wherein the filtration unit comprises a support screen.
 7. Thefiltration system of claim 1, wherein the holding frame comprises aholding frame aperture sized for the filtration unit.
 8. The filtrationsystem of claim 1, wherein the positioning element comprises a straightor an angled configuration along the filtration unit.
 9. The filtrationsystem of claim 1, wherein the positioning element centers thefiltration unit within the holding frame.
 10. A filtration system for agas turbine engine, comprising: a holding frame; the holding framecomprising a positioning element extending therefrom; and a filtrationunit for mounting within the holding frame; the filtration unitcomprising a positioning slot therein such that the positioning elementextends through the positioning slot when the filtration unit is mountedwithin the holding frame; and wherein the filtration unit comprises anend cap, the positioning slot is positioned about the end cap, and theend cap comprises a substantial W-shaped orientation.
 11. A filtrationsystem for a gas turbine engine, comprising: a holding frame; theholding frame comprising a positioning rod extending therefrom; and asquare filter for mounting within the holding frame; the square filtercomprising an end cap; the end cap comprising a positioning slot thereinsuch that the positioning rod extends through the positioning slot whenthe square filter is mounted within the holding frame.
 12. Thefiltration system of claim 11, wherein the square filter comprises amini-pleat filter with a plurality of pleats therein or a bag filterwith a plurality of pockets therein.
 13. The filtration system of claim11, wherein the square filter comprises a mounting frame.
 14. Thefiltration system of claim 11, wherein the square filter comprises apair of end caps.
 15. The filtration system of claim 11, wherein the endcap comprises a substantial W-shaped orientation.